Authorities said they arrested two suspects for the assault in November that killed three workers at the Rio Blanco copper development, but were fired upon as they tried to arrest a third suspect.
Zijin’s $1.4 billion Rio Blanco project has locked local communities and companies in a bitter environmental dispute marred by violence.
It has also put pressure on President Alan Garcia, whose approval rating is just 26 percent, to find a balance between luring foreign investment to oil and mining projects and protecting the environment.
“We were trying to arrest those responsible for what happened in November … and we were attacked by bullets and rocks while trying to catch one suspect. We responded in legitimate defense,” General Walter Rivera told Reuters.
Rivera, who said police and civilians were among the wounded, said the suspect escaped during the shootout.
David Velazco, a lawyer for the victims, said police used excessive force. He said police were serving warrants for eight suspects in the November attack, but there were no warrants out for the arrest of the two peasants killed on Wednesday.
“The peasants didn’t shoot anybody. They don’t have arms, only arrows or maybe some rocks,” he said.
The company declined comment.
The government of Peru, a leading global minerals exporter, said it would investigate and that violence must stop.
“We won’t permit chaos. We’ll use all the tools the Constitution gives us to guarantee security and (prevent) attacks on public and private property,” said Prime Minister Javier Velasquez.
The Rio Blanco development, 500 miles (800 km) north of Lima, Peru’s capital, is run by Monterrico Metals of Britain, which was bought by Zijin in 2007.
In 2005, one protester was killed and two dozen were beaten when townspeople mobilized against the mine, which they said would cause pollution and hurt water supplies.
In Britain, rights groups have filed a lawsuit against Monterrico over the 2005 clash.
Last month, 15 to 20 gunmen invaded the mining camp and set it ablaze.
Politicians have called it revenge for the 2005 clash or the work of drug traffickers. Rivera said he has yet to assign a motive for the attack, even though suspects were identified.
Garcia’s administration often tries to hurt the credibility of environmental groups by taking them to court or calling them terrorists. Human rights groups say he tries to play on the fears of Peruvians who remember the leftist insurgencies of the 1980s and 1990s.
